Improvement in quartz mills or crushers



P. M. RANDALL. Quartz Mill.

No. 40,854. Patented Dec. 8, 1863.

UNITED STATES ATENT rice.

PEIINEAS M. RANDALL, OF SAN FRANCISCO, CALIFORNIA.

Specification forming part of Letters Patent No. 40,5 fl, dated December8, 1663.

To all whom it may concern Be it known that I, PHINEAS M. RANDALL, ofSan Francisco, in the county of San Francisco and State of California,have invented a new and improved rotary muller, designed more especiallyfor the reduction of quartz and the amalgamation of metals containedtherein and I do hereby declare that the following is a full, clear, andexact description of the same, reference being had to the accompanyingdrawings, making a part of this specification, in which Figure l is aplan or top view of my invention fitted in a pan; Fig. 2, a detachedinverted plan or face view of the same; Fig. 3, a vertical section ofFig. 1, taken in the line .17 00.

Similar letters of reference indicate corresponding parts in the severalfigures.

The object ofthis invention is to obtain a muller which will operate insuch a manner as to subject the article being ground or reduced to acontinuous operation until the article is reduced to the desired degreeof comininution.

The invention is applicable to the reduction of most substances to apulpy or pasty consistency, but is more especially designed for thereduction of quartz and the amalgamation of the metals containedtherein.

To enable those skilled in the art to fully understand and construct myinvention, 1 will proceed to describe it.

A, Figs. 1 and 2, represents a circular pan provided at its center withan upright hub, B, and C represents a muller which has a circularopening, a, at its center to receive the hub B of the pan A or allow thehub to pass through the muller.

D D represent grinding plates on the face of the muller, and E E aregrooves which are between the grinding-plates 1) D, said grooves as wellas the grinding-plates being of spiral or involute form, as shownclearly in Fig. 2. The top or upper surface of the muller is perfectlysmooth, and has a ring, F, attached to it by standards I), the hub Bpassing through the ring and preventing the muller having any lateralplay or vibration. The ring F has gudgeons 0 attached to it, to whichthe driving mechanism is attached. The opening a at the center of themuller C is larger than that in the ring F, and a space is allowedbetween the hub B and the opening a, as shown clearly in Fig. 3. The panA is rather greater in diameter than the muller C, and both the pan andmuller are of iron, the muller beingofsufticient thickness to have therequisite weight for crushing the substances to be operated upon. Thegrinding-plates D D may be made or cast separate from the mullerplate(designated by D) and secured thereto by bolts or in any proper way. Themulleris rotated in the direction indicated by the arrow, and the'pulpor substance in the pan underneath the muller will be forced from theperiphery of the latter toward its center, owing to the involnte groovesE E, and will be subjected to a grinding action or process by theplates 1) D. The pulp, as it reaches the center of the m uller, isforced upward around the hub B of the pan A and out through the spacesbetween the standards I), and is then by centrifugal force expelledoutward to the periplr cry of the muller, and passes down againunderneath the muller, to be again forced toward its center. Thus itwill be seen that the substance in the pan is continually subjected to agrinding action,which may be prolonged until the desired degree of comminution is attained.

Having thus described my invention, what I claim as new, and desiretosecure by Letters Patent, is-

A rotaI-y muller provided at its face side with grooves of involute orother form, which will convey or force the substance acted upon from theperiphery of the muller toward irs center, and thence upward through themuller, so that the substance may be expelled by centrifu gal forcetoward the periphery of the muller, and then pass down again underneaththe muller to be forced toward its center as before, as herein setforth.

PHINEAS M. RANDALL.

Witnesses JAS. F. HUBBARD, HENRY Harerrr.

